Line tool preview

Hi,
I noticed little stuff that can be done differently.
Take a look at the method KisToolLine::paintLine(QPainter& gc, const QRect&)
for painting line-preview when you use line tool:
http://pastebin.com/m2cba0f11
I think that instead of static_cast<int> we could use qRound as it is more
precise. 0,7 is 0 with static_cast. With qRound 1.
I'm not sure, that's why I'm asking.
If you agree to use qRound, I can commit.
Lukas